 Though never explicitly stated, the later books tend to treat werewolves as a subset of shapeshifters.In "Witchlight", when Keller tells the history of shapeshifters, she lists felines, bears, eagles, and wolves as groups or clans within the shapeshifter race.The description of both werewolves and shapeshifters as second-class citizens also supports the notion that werewolves are a subset, or one family, of shapeshifters.